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how to calculate coefficients in matlab?

Question asked by salehi.arsalan on Jun 5, 2014
Latest reply on Jul 28, 2014 by luc.fohrer
hi, im going to design and IIR biquad filter in matlab FTDTOOL and use generated coefficients in cmsis dsp function arm_biquad_cascade_df1_f32     () .
i design an IIR filter for example 8th order and set filter arithmetic to single precision floating point and then export filter to workspace. there will be two matrix. i copy bx0 bx1 bx2 and ax1 ax2 (ax0 alway 1) from sos matrix to keil and dont use gain matrix because i dont know where to use it. and the filter does not work.(output is near zero)
my question is how to generate coefficient to use in arm_biquad_cascade_df1_f32     () ?